Subject: Re: how to get FreeBSD ping.c into NetBSD?To: None <tech-net@NetBSD.org>From: David Young <dyoung@pobox.com>List: tech-netDate: 11/22/2006 11:27:55

On Wed, Nov 22, 2006 at 06:17:15PM +0100, Gert Doering wrote:
> Hi folks,
>
> today I was (again) in need of being able to "ping" with a specific source
> address, as opposed to "whatever interface the packet happens to leave via".
>
> This is fairly regularily needed in environments where different source IPs
> are handled differently - for example due to IPSEC rules, or due to different
> firewall rules.
>
> NetBSD ping doesn't have a "-S <src addr>" flag, while FreeBSD ping has
> - and just compiling the FreeBSD 6.x "ping.c" source on NetBSD made it
> work (with two minor changes).
Gert,
ping -I does what you want, however, you wouldn't know it from reading
the manual page:
-I ifaddr
Send multicast datagrams on the network interface specified by
the interface's hostname or IP address.
Dave
--
David Young OJC Technologies
dyoung@ojctech.com Urbana, IL * (217) 278-3933